Malicious PDF — malware analysis report

Static analysis result for SHA-256 9780e2937f088981…

MALICIOUS

PDF

70.3 KB Created: 2021-09-07 01:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3a7e86005cdca0dea7e8e2ee8f46fe1d SHA-1: 60d8a4ed4a3957605740a38f1b903d4e4e8b2107 SHA-256: 9780e2937f0889816ae1813b3fef5f93a9cfb707c1e5ef414a92e1378c5f1c9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to lure users to malicious content. The presence of multiple external URIs and link farm heuristics indicates a multi-stage attack, likely involving redirection to phishing pages or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://gildiamasterov.ru/userfiles/file/99589979866.pdf In PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/5008b60fe95a0d530dedd64c2fd35179/pojetigukugagasikefubot.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/47281011372.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/fupigedu.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/r1u2at85fbtq9lc5jqnkb19nu2/77355264476.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/mufafabidiketofifu.pdfIn PDF document text
    • http://consade.com/userfiles/file/fupolidoresiduba.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/28307170977.pdfIn PDF document text
    • http://ddp-gold.com/UserFiles/file/buzomikibubamipojisud.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/aqjdap5vfa0bsd0e8bhdu5b2t9/jolakixajonoxuwutibej.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/18r9ig63rdbj1l4tv49kd3ce84/bomitodosodokaga.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881623e1351---47496256510.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xivezerijaxis.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace624a5f9b---memosisalutirojasupulivu.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/7chtdoq2foqcc7gi3optcj35q1/dafegapejosugotijujafuvo.pdfIn PDF document text
    • http://vo23.ru/upload/file/47006124732.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/81642576710.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16094bcedb89bd---67268432393.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/66167802030.pdfIn PDF document text
    • https://media-get.com/userfiles/files/64849412007.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b61bc1c514e---30441193542.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079aeb4136f2---50261793599.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/mixaxodefovexaju.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/24441062333.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/69427a1d241c1a19c52c56d548675c2b/71082598940.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=russelectric+rmtd+manualPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB770 10556 bytes
SHA-256: 08dab4ce5fcf5ccf47313b59945ccd6e1222eb20a5ee0d64c213dd9f7e892072
font_01_sfnt_off0000cf77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE789 14680 bytes
SHA-256: 02e250f9c1e69ea3698a6511261f7696c4015ca78a9096f86b122851a771c934

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